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 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "This notebook was prepared by [Donne Martin](http://donnemartin.com). Source and license info is on [GitHub](https://github.com/donnemartin/data-science-ipython-notebooks)."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# PDB\n",
    "\n",
    "The pdb module defines an interactive source code debugger for Python programs.  Below are frequently used commands:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "# Run pdb when this line is hit\n",
    "import pdb; pdb.set_trace()\n",
    "\n",
    "# Run pdb when the script is run\n",
    "python -m pdb script.py\n",
    "\n",
    "# Help\n",
    "h[elp]\n",
    "\n",
    "# Show current content\n",
    "l[ist]\n",
    "\n",
    "# Examine variables\n",
    "p[rint]\n",
    "\n",
    "# Pretty print\n",
    "pp\n",
    "\n",
    "# Go to next line\n",
    "n[ext]\n",
    "\n",
    "# Step into\n",
    "s[tep]\n",
    "\n",
    "# Continue execution until the line with the line number greater \n",
    "# than the current one is reached or when returning from current frame.\n",
    "until\n",
    "\n",
    "# Return\n",
    "r[eturn]\n",
    "\n",
    "# See all breakpoints\n",
    "b to see all breakpoints\n",
    "\n",
    "# Set breakpoint at line 16\n",
    "b 16 \n",
    "\n",
    "# Clear breakpoint 1\n",
    "cl[ear] 1\n",
    "\n",
    "# Continue\n",
    "c[ontinue]\n",
    "\n",
    "# Conditional breakpoints, line 11\n",
    "b 11, this_year == 2015\n",
    "\n",
    "# Stack location\n",
    "w[here]\n",
    "\n",
    "# Go up in stack\n",
    "u[p]\n",
    "\n",
    "# Go down in stack\n",
    "d[own]\n",
    "\n",
    "# Longlist shows full method of where you're in (Python 3)\n",
    "ll\n",
    "\n",
    "# Quit\n",
    "q[uit]"
   ]
  }
 ],
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